BT M4 stock

Would anyone happen to know where I can find a Tan BT Tippmann A-5 F.E. Collapsible Stock. Actually black would look fine too, but tan is ideal. I really love how the stock has a picatinny rail on the right side so that you can attach an adustable cheek piece or whatever to it. And from what I've seen BT are the only ones that make a stock like that. So if anyone could help me out that'd be great. Or even if you know of a stock that has the same funcionality give me a shout!